WO2017098688A1

WO2017098688A1 - Head-up display apparatus

Info

Publication number: WO2017098688A1
Application number: PCT/JP2016/004823
Authority: WO
Inventors: 和夫荒井; 弘雅三浦
Original assignee: カルソニックカンセイ株式会社
Priority date: 2015-12-09
Filing date: 2016-11-07
Publication date: 2017-06-15
Also published as: JP2017107050A; US11009700B2; US20180335623A1; JP6671942B2

Abstract

Provided is a head-up display apparatus that reduces troubles caused by separation of a display image in a horizontal direction. A head-up display apparatus (1) is characterized by including: a display source (2) provided inside an instrument panel (6); an opening part (7) which is provided in the instrument panel (6) and through which display light from the display source (2) is discharged; and an opening part cover (5) provided around the opening part (7), wherein at both end parts (51, 53), in the horizontal direction, of the opening part cover (5), the color or the reflectance thereof changes from the opening part sides (52a and 54a) toward the outer sides (52b and 54b).

Description

Head-up display device

Cross-reference to related applications

This application claims the priority of Japanese Patent Application 2015-240299 (filed on December 9, 2015), the entire disclosure of which is incorporated herein by reference.

The present invention relates to a head-up display device.

In the conventional head-up display device, there has been a technique of displaying information superimposed on the foreground viewed by the driver (for example, Patent Document 1). According to this technique, the driver can simultaneously observe the display image by the head-up display device and the foreground.

JP-A-4-96778

The focal length of the display image by the head-up display is 1 m to 5 m, while the distance of the foreground (road, leading vehicle, building, etc.) is 5 m to infinity. Therefore, when the driver observes the foreground, there is a problem that the display image and the reflection image of the opening cover are separately separated and observed due to the parallax of both eyes, which is troublesome for the driver.

Therefore, an object of the present invention made in view of the above problems is to provide a head-up display device capable of reducing the troublesomeness due to the horizontal separation of the virtual image visually recognized by the driver.

In order to solve the above-mentioned subject, the head up display device concerning one embodiment of the present invention is:
A display source provided in the instrument panel,
An opening provided on the instrument panel for emitting display light from the display source;
An opening cover provided around the opening;
Have
It is characterized in that a change in color or a change in reflectance is made from the side of the opening toward the outside at both horizontal direction end portions of the opening cover.

According to the head-up display device according to the embodiment of the present invention, it is possible to reduce the troublesomeness due to the horizontal separation of the virtual image of the opening cover viewed by the driver.

FIG. 1 is an overall schematic view of a head-up display device according to a first embodiment. It is the figure which looked at the opening part cover of the head-up display apparatus which concerns on Embodiment 1 from upper direction. It is a figure which shows the virtual image of the opening part cover which a driver visually recognizes by the head-up display apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the virtual image of the opening part cover of a comparative example which a driver visually recognizes. It is a figure which shows the isolation | separation width in, when observing a distant view. It is a 1st modification of an opening part cover. It is a 2nd modification of an opening part cover. It is a 3rd modification of an opening part cover. FIG. 16 is a view of the liquid crystal display 22 of the head-up display device according to Embodiment 2 as viewed from above. It is a figure by the head-up display apparatus which concerns on Embodiment 2 which shows the display image which a driver visually recognizes. It is a figure which shows the display image of a comparative example which a driver visually recognizes.

Hereinafter, Embodiment 1 of the present invention will be described.

(Embodiment 1)
FIG. 1 is an overall schematic view of a head-up display device 1 according to a first embodiment of the present invention. The head-up display device 1 according to the first embodiment is, as a general matter, mainly to reduce the troublesomeness due to the horizontal separation of the virtual image in the daytime. A head-up display device 1 according to an embodiment of the present invention includes a display source 2, a reflecting member 3, a transparent cover 4, and an opening cover 5, and is provided in a vehicle. Specifically, the head-up display device 1 is provided in front of the meter in the vehicle traveling direction inside the instrument panel 6 of the vehicle.

The display source 2 includes a backlight 21 and a liquid crystal display 22 (Liquid Crystal Display: LCD 22). Then, the display source 2 projects display light toward the reflecting member 3. In addition, the structure of the display source 2 is not restricted to this, For example, you may comprise by LED (Light Emitting Diode) etc.

The reflecting member 3 is provided on the optical path of the display light from the display source 2 as shown in FIG. 1, and the projected display light from the display source 2 is transmitted through the transparent cover 4 and directed to the front windshield 8 To reflect. In the present embodiment, the reflecting member 3 is a concave mirror and is described as enlarging and displaying a display image, but the present invention is not limited to this. For example, the reflecting member 3 may be configured by a plane mirror.

The transparent cover 4 and the opening cover 5 are provided between the head-up display device 1 and the opening 7 in order to prevent contamination of the head-up display device 1 and the instrument panel 6 with dust etc. from the opening 7. There is. The opening 7 is provided in the instrument panel 6 so that the display light from the reflecting member 3 is projected on the front windshield 8.

The front windshield 8 reflects the display light from the reflecting member 3 toward the driver. The driver visually recognizes a virtual image formed by the reflected display light in front of the vehicle, that is, the display image 9.

In addition to the display image 9, the reflection image of the opening cover 5, that is, the virtual image 10 is also formed in front of the vehicle. The virtual image 10 is more clearly visible when the opening cover 5 is exposed to a certain degree or more of external light in the daytime or the like.

FIG. 2 is a view of the opening cover 5 as viewed from above. The opening cover 5 is provided around the opening 7. Further, at both horizontal end portions (51, 53) of the opening cover 5, a color change is made from the opening side (51a, 53a) toward the outside (51b, 53b). In the present embodiment, a gradation that changes from black to the color of the instrument panel 6 is applied from the opening side (51a, 53a) to the outside (51b, 53b). The color of the instrument panel 6 is, for example, gray. In FIG. 2, the gradation is applied in three stages of color tones, but the invention is not limited to this, and may be two stages, or four or more stages.

Further, the opening cover 5 shown in FIG. 2 changes in color from the opening side (52a, 54a) to the outside (52b, 54b) at both end portions (52, 54) of the opening cover 5 in the vertical direction. It is on. In the present embodiment, a gradation that changes from black to the color of the instrument panel 6 is applied from the opening side (52a, 54a) to the outside (52b, 54b).

FIG. 3 is a virtual image 10 of the opening cover 5 viewed by the driver. The virtual image 10 includes a central portion 11 corresponding to the opening 7 and a peripheral portion (12, 13). Since the opening 7 does not reflect external light, the foreground of the vehicle and the display image by the head-up display device 1 can be seen in the central portion 11. On the other hand, outside light is reflected to the opening cover 5 at the peripheral portion. In this embodiment, since the gradation changing from black to the color of the instrument panel 6 is applied from the opening side (51a, 53a) of the opening cover 5 toward the outside (51b, 53b), the opening Outside light is hardly reflected on the side (51a, 53a). On the other hand, outside light (51b, 53b) of the opening cover 5 reflects external light similarly to the instrument panel 6. Therefore, as shown in FIG. 3, the peripheral portion (12, 13) of the virtual image 10 is blurred and displayed. Since the peripheral parts (12, 13) of the virtual image 10 are blurred and displayed, is the peripheral parts (12, 13) separated even if the virtual image 10 is separated in the horizontal direction by the parallax of both eyes? I can not tell. As described above, according to the embodiment of the present invention, since the color of the opening cover 5 is changed from the opening side (51a, 53a) to the outside (51b, 53b), the virtual image seen by the driver It is possible to reduce the troublesomeness due to the horizontal separation of

Further, in the present embodiment, the color is changed from the opening side (52a, 54a) to the outside (52b, 54b) at both end portions (52, 54) of the opening cover 5 in the vertical direction. Therefore, since both the horizontal edge and the vertical edge of the virtual image 10 are blurred and displayed, the driver can visually recognize the virtual image without a sense of discomfort.

As a comparative example, the virtual image in the case where the opening cover 5 is not changed in color is shown. FIG. 4 is a virtual image 10 b of the opening cover of the comparative example that the driver visually recognizes. The virtual image 10b is observed when the driver is observing the foreground, and as shown in FIG. 4, it can be seen that the virtual image 10b reflected by the opening cover has been separated in the horizontal direction by the parallax of both eyes.

Here, in the opening cover 5, the width of the area to be changed in color (the distance between 51a and 51b and the distance between 53a and 53b in FIG. 2, hereinafter referred to as a gradation area) is It is preferable to make the width substantially the same as the width (hereinafter referred to as the separation width) at which the near view is separated by the parallax of both eyes. FIG. 5 is a diagram showing the separation width when observing a distant view. In FIG. 5, the distance to the distant object is X1, the distance to the near object is X2, the interpupillary distance of the driver is PD, the angle of the line connecting the distant object and both eyes is α, and the separation width is It is y. The following Equation (1) and Equation (2) are established between them.

For example, when X1 is at infinity, X1 becomes larger than X2, and the following approximate expression (3) can be derived from the above expressions (1) and (2).

Here, the interpupillary distance PD is generally about 60 mm to 70 mm. Therefore, the width of the gradation area is preferably about the same as y, that is, about 60 mm to 70 mm. If the width of the gradation area is equal to or larger than y, separation of the peripheral portions (12, 13) can be prevented.

Moreover, the minimum value (ymin) of the width | variety of the said area | region is represented by following Numerical formula (4), when visual acuity of a driver is set to VA.

For example, assuming that the visual acuity is 0.7, the minimum value of y is expressed by the following equation (5).

In the above embodiment, an example is shown in which the gradation changing from black to the color of the instrument panel 6 is applied from the opening side (52a, 54a) of the opening cover 5 toward the outside (52b, 54b). It is not limited to. The 1st modification of the opening part cover 5 is shown in FIG. As shown in FIG. 6, the color may be changed by a black vertical stripe pattern from the opening side (52a, 54a) of the opening cover 5 toward the outside (52b, 54b). In this case, the width of the stripe may not be constant. For example, the width may be larger toward the opening, and may be smaller toward the outside. Since the peripheral portion, that is, the edge portion of the virtual image is not clear even by the stripes, it is possible to reduce the troublesomeness due to the horizontal separation of the virtual image visually recognized by the driver.

Further, FIG. 7 shows a second modified example of the opening cover 5. In the second modified example, the color change does not occur in the vertical direction both ends (52, 54), and the outer side (51 b, 51 b, 53 a) from the opening side (51 a, 53 a) It is changing color towards 53 b). Since the virtual image is separated only in the horizontal direction by the parallax of both eyes, even if the color is changed only in the horizontal direction, it is possible to reduce the troublesomeness due to the separation in the horizontal direction of the virtual image visually recognized by the driver.

Further, FIG. 8 shows a third modified example of the opening cover 5. In the third modified example, a black sawtooth shape (zigzag shape) pattern is provided at both horizontal direction end portions (51, 53). Also by the pattern, the peripheral edge portion of the virtual image is not clear as compared with the comparative example, so that it is possible to reduce the troublesomeness due to the horizontal separation of the virtual image visually recognized by the driver. A similar effect can be obtained by applying a black dot-like or mosaic-like pattern at both end portions (51, 53) in the horizontal direction, in addition to the modified example shown here. That is, in the present embodiment, a color change or reflectance is obtained by applying gradation or a pattern so that the reflectance of outside light is different at least at both horizontal direction end portions (51, 53) of the opening cover 5. It is characterized by the change of By doing this, the reflectance of the external light of the opening cover 5 is made different, and the peripheral portion of the virtual image of the opening cover 5 is blurred and displayed, and the troublesomeness due to the horizontal separation of the virtual image visually recognized by the driver is made. It can be reduced.

Second Embodiment
The second embodiment of the present invention will be described below. The head-up display device 1 according to the second embodiment is to reduce annoyance due to the separation of the virtual image in the horizontal direction mainly at night as a rough outline. The entire configuration of the head-up display device 1 is the same as that of the first embodiment, so the same reference numerals are given and the description is omitted. The head-up display device 1 according to the second embodiment is different from the configuration according to the first embodiment in the configuration of the display light emitting surface of the display source 2, that is, the configuration of the liquid crystal display 22 here.

FIG. 9 is a top view of the liquid crystal display 22 of the head-up display device 1 according to the second embodiment. The liquid crystal display 22 according to the second embodiment changes the transmittance of display light from the inside (221a, 223a) to the outside (221b, 223b) of the emission surface of display light at both end portions (221, 223) in the horizontal direction. I am wearing Specifically, the gradation of display light transmittance decreases from the inside (221a, 223a) to the outside (221b, 223b) from the inner side (221a, 223a) of the horizontal direction both end parts (221, 223). Note that, for example, a change in the transmittance is made by gradually applying a paint having a predetermined transmittance gradually from the inner side (221a, 223a) to the outer side (221b, 223b). In FIG. 9, although gradation is applied at two stages of transmittance, the present invention is not limited to this, and three or more stages may be employed.

FIG. 10 is a view showing a display image visually recognized by the driver by the head-up display device according to the second embodiment. The display image displays, for example, information such as the vehicle speed (here, 42 km / h) as shown in Fig. 10. Here, the background portion 91 other than the information display portion can not have zero luminance. In the present embodiment, the transmittance of display light is changed at both ends (221, 223) in the horizontal direction of the liquid crystal display 22. When the peripheral portions (92, 94) of the display image 9 are blurred and displayed, the peripheral portion (92, 94) of the display image is blurred and displayed. Even if they are separated, the peripheral portions (92, 94) do not appear to be separated according to one embodiment of the present invention. , 223) change the transmittance of the display light And for that, it is possible to reduce the burden caused by the horizontal separation of the virtual image by the driver to visually recognize.

As a comparative example, an example in the case where the change in the transmittance of display light is not made at both end portions in the horizontal direction of the liquid crystal display 22 will be shown. FIG. 11 is a display image 9 b of a comparative example visually recognized by the driver. The display image 9b is observed when the driver is observing the foreground, and as shown in FIG. 11, the display image and the reflection image of the opening cover are separated in the horizontal direction due to the parallax of both eyes. I understand.

In addition, the width of the area (the distance between 221a and 221b in FIG. 9 and the distance between 223a and 223b in FIG. 9) in which the change in the transmittance of display light is applied to both horizontal ends (221, 223) of the liquid crystal display 22 Hereinafter, it is preferable to make the second gradation region substantially the same as the width separated by the parallax of both eyes. That is, it is preferable that the second gradation area be substantially the same as y represented by the above formulas (1) to (3). When the width of the second gradation area is increased, the area of the central display area 222 (the central portion 93 of the display image) is reduced. Therefore, it is preferable to secure the area of the central display area 222 by suitably setting the second gradation area to about 60 mm to 70 mm. By doing this, it is possible to secure the display area of the display image while reducing the troublesomeness due to the horizontal separation of the virtual image visually recognized by the driver.

In the above embodiment, an example is given in which the gradation of display light transmittance decreases from the inside (221a, 223a) to the outside (221b, 223b) from the inside (221a, 223a) of both horizontal ends (221, 223) of the liquid crystal display 22. Although shown, it is not limited to this. Similarly to the modification shown in the opening cover 5, a vertical stripe is formed of paint having a low transmittance from the inner side (221a, 223a) to the outer side (221b, 223b) of both horizontal end portions (221, 223) A sawtooth shape or a dot shape pattern may be provided to change the transmittance of display light. Also, the change in transmittance may be applied to the edge in the vertical direction. Further, in the above-described embodiment, although an example in which gradation is applied to the liquid crystal display 22 has been described, the present invention is not limited to this. For example, the transmittance of display light may be changed by gradation or the like from the inside to the outside of the projection surface of the transparent cover 4.

The configurations of Embodiment 1 and Embodiment 2 may be combined. That is, at both horizontal end portions (51, 53) of the opening cover 5, a color change is made from the opening side (51a, 53a) to the outer side (51b, 53b), and the horizontal direction of the liquid crystal display 22 The transmittance of display light may be changed at both ends (221, 223). When both configurations are combined, separation due to parallax can be prevented for both the virtual image of the opening cover 5 and the virtual image of the display image by the head-up display device 1. For example, since both virtual images may be visually recognized by a street lamp even in the evening time zone or at night, by employing the above configuration, it is troublesome to separate virtual images visually recognized by the driver in various scenes. Can be reduced.

The display source 2 may display a display image including a colored background color. In this case, the display source 2 may display a display image in which the luminance at both ends in the horizontal direction of the display image is changed. The change is preferably made, for example, by gradation. By doing this, the edge of the display image is displayed blurry, and it is possible to reduce the troublesomeness due to the horizontal separation of the virtual image visually recognized by the driver. In this case, the width of the area to be changed due to gradation or the like may be adaptively changed in accordance with the imaging distance of the display image. For example, since the degree of separation of the display image by parallax increases when the imaging distance of the display image is short (in the case of less than a predetermined distance), the width of the region may be widened. On the other hand, since the degree of separation of the display image due to parallax is reduced when the image forming distance of the display image is long (in the case of a predetermined distance or more), the width of the region may be narrowed. By doing this, it is possible to adaptively reduce the troublesomeness due to the horizontal separation of the virtual image visually recognized by the driver. In addition, the head-up display device 1 may further include a line-of-sight measurement device that measures the line of sight of the driver's eyes. In this case, the line-of-sight measurement device estimates the distance X1 to the distant target based on the convergence angle of both eyes. If X1 can be estimated, the separation width y can be calculated by the above equation (2). Then, the head-up display device 1 sets the width of the area to be changed due to gradation or the like to be the same as y. For example, when X1 is small, y is small, and the width of the region can be set narrow. By doing this, it is possible to adaptively prevent separation due to parallax, reduce discomfort, and secure a wide display area as much as possible according to the line of sight of the driver.

Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes and modifications based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, each means, functions included in each step, etc. can be rearranged so as not to be logically contradictory, and it is possible to combine or divide a plurality of means, steps, etc. into one. .

DESCRIPTION OF SYMBOLS 1 head up display apparatus 2 display source 3 reflective member 4 transparent cover 5 opening part cover 6 instrument panel 7 opening part 8

front windshield

9,

9b display image

10, 10b virtual image 11

center part

12, 13 peripheral part 21 back light 22 Liquid Crystal Displays 221, 223, 51, 53 Horizontal Ends 222

Display Area

52, 54 Vertical Ends

Claims

A display source provided in the instrument panel,
An opening provided on the instrument panel for emitting display light from the display source;
An opening cover provided around the opening;
Have
A head-up display device characterized in that a change in color or a change in reflectance is made from the side of the opening toward the outside at both end portions in the horizontal direction of the opening cover.
2. The head-up display device according to claim 1, wherein a change in color or a change in reflectance is made from the side of the opening toward the outside at both vertical direction end portions of the opening cover.
2. The head-up display device according to claim 1, wherein a gradation that changes from black to the color of the instrument panel is applied from the side of the opening to the outside.
The head-up according to claim 1, wherein the transmittance of the display light is changed from the inside to the outside of the emission surface at both end portions in the horizontal direction of the display light emission surface of the display source. Display device.
A display source provided in the instrument panel,
An opening provided on the instrument panel for emitting display light from the display source;
A transparent cover provided between the display source and the opening;
Have
In the horizontal direction both ends of the emission surface of the display light in the display source, the transmittance of the display light is changed from the inside to the outside of the emission surface or from the inside to the outside of the projection surface of the transparent cover A head-up display device characterized by
The head according to claim 4, characterized in that gradation is provided to lower the transmittance of the display light from the inside to the outside of the emission surface at both horizontal direction end portions of the display light emission surface of the display source. Up display device.